<?php


/*
 * 小程序微信支付
 */
namespace WeixinPay;

//use app\index\model\Goods as GoodsModel;
//use think\Db;

class WeixinPay {

    protected $appid;
    protected $mch_id;
    protected $key;
    protected $openid;
    protected $out_trade_no;
    protected $body;
    protected $total_fee;
    protected $notify_url;

    /**
     * WeixinPay constructor.
     * @param $openid   用户openid
     * @param $out_trade_no 订单编号
     * @param $body  订单描述
     * @param $total_fee 支付金额
     * @param $notify_url 支付回调地址
     */
    function __construct($openid='',$body='',$total_fee='',$out_trade_no='') {
        $this->appid = config('applet')['tenant']['appid'];
        $this->mch_id = config('applet')['tenant']['mch_id'];
        $this->key = config('applet')['tenant']['key'];
        $this->out_trade_no = $out_trade_no;
        $this->body = $body;
        $this->total_fee = $total_fee;
        $this->openid = $openid;
        $this->notify_url = 'https://apiwisdom.yuyankeji.cn/applet/wx_pay/notify';
    }


    public function pay() {
        //统一下单接口
        $return = $this->weixinapp();
        return $return;
    }


    //统一下单接口
    private function unifiedorder() {
        $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
        $parameters = array(
            'appid' => $this->appid, //小程序ID
            'mch_id' => $this->mch_id, //商户号
            'nonce_str' => $this->createNoncestr(), //随机字符串
            'body' => $this->body,
            'out_trade_no'=> $this->out_trade_no,//商户订单号
            'total_fee' => floatval($this->total_fee * 100), //总金额 单位 分
            'spbill_create_ip' => $_SERVER['REMOTE_ADDR'], //终端IP
            'notify_url' => $this->notify_url, //通知地址  确保外网能正常访问
            'openid' => $this->openid, //用户id
            'trade_type' => 'JSAPI'//交易类型
        );

        //统一下单签名
        $parameters['sign'] = $this->getSign($parameters);
        $xmlData = $this->arrayToXml($parameters);
        $return = $this->xmlToArray($this->postXmlCurl($xmlData, $url, 60));
        return $return;
    }


    private static function postXmlCurl($xml, $url, $second = 30)
    {
        $ch = curl_init();
        //设置超时
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验
        //设置header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
		

        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
        curl_setopt($ch, CURLOPT_TIMEOUT, 40);
        set_time_limit(0);


        //运行curl
        $data = curl_exec($ch);
		//var_dump($data);exit;
        //返回结果
        if ($data) {
            curl_close($ch);
            return $data;
        } else {
            $error = curl_errno($ch);
            curl_close($ch);
            throw new WxPayException("curl出错，错误码:$error");
        }
    }



    //数组转换成xml
    private function arrayToXml($arr) {
        $xml = "<xml>";
        foreach ($arr as $key => $val) {
            if (is_array($val)) {
                $xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";
            } else {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            }
        }
        $xml .= "</xml>";
        return $xml;
    }


    //xml转换成数组
    private function xmlToArray($xml) {
        //禁止引用外部xml实体 
        libxml_disable_entity_loader(true);
        $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
        $val = json_decode(json_encode($xmlstring), true);
        return $val;
    }


    //微信小程序接口
    private function weixinapp() {
        //统一下单接口
        $unifiedorder = $this->unifiedorder();
        if ($unifiedorder['return_code'] === 'FAIL') {
            returnJson(-2022,$unifiedorder['return_msg'])->send();die;
        }
        //var_dump($unifiedorder);exit;
        $parameters = array(
            'appId' => $this->appid, //小程序ID
            'timeStamp' => '' . time() . '', //时间戳
            'nonceStr' => $this->createNoncestr(), //随机串
            'package' => 'prepay_id=' . $unifiedorder['prepay_id'], //数据包
            'signType' => 'MD5'//签名方式
        );
        //签名
        $parameters['paySign'] = $this->getSign($parameters);
        return $parameters;
    }


    //作用：产生随机字符串，不长于32位
    private function createNoncestr($length = 32) {
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str = "";
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
    }


    //作用：生成签名
    private function getSign($Obj) {
        foreach ($Obj as $k => $v) {
            $Parameters[$k] = $v;
        }
        //签名步骤一：按字典序排序参数
        ksort($Parameters);

        $String = $this->formatBizQueryParaMap($Parameters, false);

        //签名步骤二：在string后加入KEY
        $String = $String . "&key=" . $this->key;

        //签名步骤三：MD5加密
        $String = md5($String);
        //签名步骤四：所有字符转为大写
        $result_ = strtoupper($String);
        return $result_;
    }


    ///作用：格式化参数，签名过程需要使用
    private function formatBizQueryParaMap($paraMap, $urlencode) {
        $buff = "";

        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if ($urlencode) {
                $v = urlencode($v);
            }
            $buff .= $k . "=" . $v . "&";
        }
        //$reqPar;
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }
    /**
     * 微信支付退款
     * $pay_sn      支付单号
     * $total_fee   订单金额
     * $refund_fee  退款金额$pay_sn, $total_fee, $refund_fee
     */
    public function rkAlipay($pay_sn, $total_fee, $refund_fee)
    {
        $url = "https://api.mch.weixin.qq.com/secapi/pay/refund";
        $data["appid"]            =  $this->appid;  //应用ID
        $data["mch_id"]           =  $this->mch_id;  //商户号
        $data["nonce_str"]        =  $this->createNoncestr(32);  //随机字符串
        $data['out_trade_no']     = $pay_sn; // 订单号
        $data['out_refund_no']    = $pay_sn;   //退款单号
        $data["total_fee"]        = intval($total_fee * 100);  //订单金额
        $data["refund_fee"]       = intval($refund_fee * 100);  //退款金额
        $sign                     = $this->getSign($data);  //签名
        $data["sign"]             = $sign;
        $xml      = $this->arrayToXml($data);
        $response = $this->postXmlCur($xml, $url);
        $response = $this->xmlToArray($response);
        return $response;
    }

    //post https请求，CURLOPT_POSTFIELDS xml格式
    public function postXmlCur($xml,$url,$second=30){
        //初始化curl
        $ch = curl_init();
        //设置超时
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);
        //这里设置代理，如果有的话
        //curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');
        //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
        curl_setopt($ch,CURLOPT_URL, $url);
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);
        //设置header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);

        //默认格式为PEM，可以注释
        curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
        //退款证书echo ROOT_PATH;die;
        curl_setopt($ch,CURLOPT_SSLCERT,ROOT_PATH.'wxhttpsrkwchat'.DS.'apiclient_cert.pem');
        //默认格式为PEM，可以注释
        curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
        //退款证书
        curl_setopt($ch,CURLOPT_SSLKEY,ROOT_PATH.'wxhttpsrkwchat'.DS.'apiclient_key.pem');
        //运行curl
        $data = curl_exec($ch);
        //返回结果
        if($data){
            curl_close($ch);
            return $data;
        }else{
            $error = curl_errno($ch);
            echo "curl出错，错误码:$error"."<br>";
            curl_close($ch);
            return false;
        }
    }

    public function cs(){}
}
